package com.lagou.handler;

import com.alibaba.fastjson.JSONObject;
import com.lagou.service.IUserService;
import com.lagou.service.RpcRequest;
import com.lagou.service.UserServiceImpl;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.lang.reflect.Method;

/**
 * 自定义的业务处理器
 */
public class UserServiceHandler extends ChannelInboundHandlerAdapter {

    //当客户端读取数据时,该方法会被调用
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        //注意:  客户端将来发送请求的时候会传递一个参数:  UserService#sayHello#are you ok
         //1.判断当前的请求是否符合规则
        RpcRequest rpcRequest = JSONObject.parseObject(msg.toString(), RpcRequest.class);
        IUserService service = new UserServiceImpl();

        Method m1 = service.getClass().getMethod(rpcRequest.getMethodName(),String.class);
        String result = (String)m1.invoke(service, rpcRequest.getParameter());
        //3.把调用实现类的方法获得的结果写到客户端
        ctx.writeAndFlush(result);
    }
}
